Update Data fails if one of the bounds has grown beyond 50k items

[mk408]

If a previous downloaded area (<bounds>) has, on the OSM server, grown to contain more than 50000 items, trying to update will fail due to the server returning an error that the requested download is too large.

A partial fix would be to continue with further requests, if there are any, and communicating the error to the user.

A complete fix would involve automatically splitting the area and retrying. Currently, I perform this manually by editing the .osm file.